package util;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.sql.DataSource;


public class DBUtils {
	
	private static DataSource dataSource;
	
	static{
		
		Context initContext;
		try {
			initContext = new InitialContext();
			Context envContext = (Context)initContext.lookup("java:/comp/env");
			dataSource = (DataSource)envContext.lookup("jdbc/myoracle");
		} catch (NamingException e) {
			e.printStackTrace();
		}
		
	}
	
	public static Connection createConnection(){
		Connection conn = null;
		try {
			conn = dataSource.getConnection();
		} catch (SQLException e) {
			e.printStackTrace();
		}
		return conn;
	}
	
	public static void close(Connection conn,PreparedStatement pst,ResultSet rs){
		try {
			if (rs!=null) {
				rs.close();
			}
			if (pst!=null) {
				pst.close();
			}
			if (conn!=null) {
				conn.close();
			}
		} catch (SQLException e) {
			e.printStackTrace();
		}
		
	}
}
